I'm very interested in the VGChartz' community's take on this question: which generation was the best for Sony's first-party output? And why?
Note: for the sake of this thread, I'm including anything published by Sony as first-party.
Fifth gen? That's Twisted Metal, Crash Bandicoot, Wild Arms, MediEvil, Spyro the Dragon, Gran Turismo, etc.
Sixth gen? That's Ico, Jak and Daxter, Ratchet & Clank, Sly Cooper, Shadow of the Colossus, God of War, etc.
Seventh gen? That's Resistance, Patapon, MotorStorm, Uncharted, LittleBigPlanet, Infamous, The Last of Us, etc.
Eighth gen? That's Driveclub, Bloodborne, Tearaway, Until Dawn, Gravity Rush, Uncharted 4, Infamous: Second Son, etc.
Choose and perish!